Apparatus for dust prevention



Aug. 11, 1953 K, JQBQRES 2,648,241

APPARATUS FOR DUST PREVENTION Filed Sept. 4, 1947 INVENTORI 'KflZMEQ J. 50955:

BY: V

HIS ATTOIVQNEY;

-/ x1 q /z I Patented Aug. 11,1953

UNITED S TA'IZ ES OFF-LC Y i 2.64am; I r

APPARATUS FOR DUST'PREVENTION' Kazmer J. Bores, Cleveland, Ohio Application September 4, 1947, Serial No. 7 72,132

1 Claim. 1

This invention relates to methods and apparatus for dust prevention in steel strip mills.

When hot steel strips pass through rolls, as for example on finishing stands, there is a tendency for fine scale particles to break off as dust. As a result often there is a considerable dust cloud around these rolls and it is objectionable to the health and comfort of workmen. It has been proposed to allay such dust by application of streams of water to the strip emerging from the rolls, but previous arrangements with which I am familiar have been ineffective because they fail to wet the scale completely.

An object of the present invention is to provide improved methods and apparatus for applying water to steel strips in strip mills in such fashion as to wet the scale thoroughly and thereby to prevent dust formation.

A further object of the invention is to provide improved methods and apparatus for dust elimination in steel strip mills wherein swirling cones of water are directed at opposite edges of the strip emerging from the rolls, and such cones cover the strip surface and thoroughly wet the scale particles.

In accomplishing these and other objects of the invention, I have provided improved details of structure, a preferred form of which is shown in the accompanying drawing wherein:

Figure 1 is an end elevational view, partly in section, showing an improved dust prevention apparatus constructed in accordance with the present invention and installed in conjunction with a strip mill; and

Figure 2 is a sectional view of the apparatus taken on line II--II of Figure 1.

Referring more in detail to the drawing:

In Figure 2 there is shown a portion of a strip mill that includes a conventional pair of rolls I0, III, a guide box II and a guide l2. Hot steel strip l3 being rolled passes through the rolls from right to left as viewed in this figure. Scale on the strip tends to break off and form dust clouds, which arise from the strip beyond the guides.

In accordance with the present invention, a water spray system, shown in detail in Figure l, is arranged to wet the strip as it emerges from the guides. The spray system includes a pair of nozzles l4 and I5, supported at opposite sides of the strip on the guide boxes. The spray system also includes suitable piping for conveying water to the nozzles. In the example shown, the piping includes an upright I6, a T connector l1 and branches l8 and I9 connected to nozzles l4 and I5, respectively. Obviously the piping system to opposite each other and as close to said edges as practicable. The strip approximately bisects each cone.

Figure 1 illustrates a typical nozzle construction capable of producing the desired type of spray. As shown in Figure 1 nozzle l5 has a longitudinal passage 20 and a discharge 2|. A system of vanes 22 is arranged in passage 20 adjacent the discharge end. Optionally the vane member has a central opening 23 useful for discharging debris in the water and preventing blocking of the vanes in case dirty water is used, as often happens around strip mills.

Water is discharged from the nozzle as a swirling cone which impinges on the sides of the strip. Nozzle I4 is preferably identical with nozzle l5, whereby the cones of water from the two nozzles swirl in opposite directions and thus oppose each other.

The action of water sprayed on steel strip by the apparatus illustrated is to wet thoroughly each side surface of the strip and any scale thereon. Scal when thoroughly wetted does not form dust, and thus dust formation is effectively prevented.

While I have shown and described but a single form of apparatus and but a single method, it is apparent that modifications may arise. For example, other designs of nozzles may produce the desired form of water spray. Therefore I do not wish to be limited to the disclosure set forth but only by the scope of the appended claim.

I claim:

In combination, a hot strip mill including a pair of rolls, means on the exit side of said rolls for maintaining hot steel strip in a substantially horizontal path as it emerges from said rolls, and an apparatus for preventing formation of dust from scale on the strip, said apparatus comprising two nozzles constructed for spraying water introduced thereto as a swirling cone having a minimum of interior void space, means mounting said nozzles in axial alignment at opposite sides of said strip path for directing said sprays towards each other and at such locations that the thickness dimension of this path bisects each 3 cone of water, and means for supplying water "Number under sumcient pressure to said nozzles to pro- 1,893,210 vide finely divided sprays capable of wetting dust 1,920,874 particles. 2,027,954: KAZMER J. BORES. 5 4 2,197,022 References Cited in the file of this patent 2,357,695 UNITED STATES PATENTS Number Name Date 485,935 Hills Nov. 8. 1892 Number 701,898 Larson June 10, 1902 1 ,51 1,107,493 Chartener Aug. 18, 1914, 1,874,080 Brislin Aug. 30, 1932 Name Date Rider Jan. 3, 1933 Meloon Aug. 1, 1933 Barclay Jan. 14, 1936 Everling Aug. 4, 1936 Petterson Apr. 16, 1940 Skowron Sept. 5, 1944 Egan Oct. 15. 1946 FOREIGN PATENTS Country Date Great Britain Accept. May 9, 1905 

